Grating-coupled silicon-on-sapphire integrated slot waveguides operating at mid-infrared wavelengths.

We demonstrate subwavelength bidirectional grating (SWG) coupled slot waveguide fabricated in silicon-on-sapphire for transverse electric polarized wave operation at 3.4 μm wavelength. Coupling efficiency of 29% for SWG coupler is experimentally achieved. Propagation loss of 11  dB/cm has been experimentally obtained for slot waveguides. Two-step taper mode converters with an insertion loss of 0.13 dB are used to gradually convert the strip waveguide mode into slot waveguide mode.

[1]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[2]  D. Moss,et al.  Low propagation loss silicon-on-sapphire waveguides for the mid-infrared. , 2011, Optics express.

[3]  Michael Hochberg,et al.  Efficient Strip to Strip-Loaded Slot Mode Converter in Silicon-on-Insulator , 2011, IEEE Photonics Technology Letters.

[4]  Qianfan Xu,et al.  Guiding and confining light in void nanostructure. , 2004, Optics letters.

[5]  Marko Loncar,et al.  Integrated high-quality factor silicon-on-sapphire ring resonators for the mid-infrared , 2013 .

[6]  Rob Ilic,et al.  Silicon waveguides and ring resonators at 5.5 µm , 2010, 7th IEEE International Conference on Group IV Photonics.

[7]  T. Baehr‐Jones,et al.  Silicon-on-sapphire integrated waveguides for the mid-infrared. , 2009, Optics express.

[8]  Jurgen Michel,et al.  Lossless strip-to-slot waveguide transformer. , 2007, Optics letters.

[9]  C. Koos,et al.  Low-Loss Silicon Strip-to-Slot Mode Converters , 2013, IEEE Photonics Journal.

[10]  Lech Wosinski,et al.  Ultracompact low-loss coupler between strip and slot waveguides. , 2009, Optics letters.

[11]  R. Soref.  Mid-infrared photonics in silicon and germanium , 2010 .

[12]  Ke Xu,et al.  Characterization of Mid-Infrared Silicon-on-Sapphire Microring Resonators With Thermal Tuning , 2012, IEEE Photonics Journal.

[13]  Jie Sun,et al.  Large-Scale Silicon Photonic Circuits for Optical Phased Arrays , 2014, IEEE Journal of Selected Topics in Quantum Electronics.

[14]  Qianfan Xu,et al.  Experimental demonstration of guiding and confining light in nanometer-size low-refractive-index material. , 2004, Optics letters.

[15]  Ke Xu,et al.  Mid-Infrared Grating Couplers for Silicon-on-Sapphire Waveguides , 2012, IEEE Photonics Journal.

[16]  Ray T. Chen,et al.  Complementary metal–oxide–semiconductor compatible high efficiency subwavelength grating couplers for silicon integrated photonics , 2012 .

[17]  Richard A. Soref,et al.  Silicon waveguided components for the long-wave infrared regionThis article was submitted to the spe , 2006 .